Read specific columns from a text file

Question

Hello,
I wanna read some specific columns from a text file, which is tab separated in fact:

    Level [l]
Time     setpoint     actual value     Output [%]         V102     Alarm
12:28:42     1,800      0,002        100         0     1   
12:28:45     1,800      0,150        100         0     1   
12:28:48     1,800      0,321        100         0     1   
 ...
 ...

Later on Ill use those columns to draw a graph. Anyway, my program is in server side and in the Reply function i need to read the lines, here is my code so far (I though that firstly i should read the lines into an array):

class Reply
    {
        public string clientMessage;
        public List<Array> list;

        public Reply(String msg)
        {
            List<Array> list = new List<Array>();       

            using (StreamReader sr = new StreamReader(@"C:\blabla\worst.txt"))
                {
                    while (!sr.EndOfStream){
                    String line = sr.ReadLine();
                        if (!string.IsNullOrEmpty(line)){
                    Array lineArray = line.Split(' ');
                    list.Add(lineArray);
                        }
                    }
                   foreach (Array line in list){ //read the columns here?              
                   }                 
                   clientMessage = msg.ToString();
            }
        }
    }

and where i use this function is here:
void onMessageReceived(SuperWebSocket.WebSocketSession session, string msg)
        {
            Reply reply = new Reply(msg);
            string json = server.JsonSerialize(reply);
            session.Send(json);
            Console.WriteLine("Message received: " + msg);
        }

I am getting some errors that i dont understand, can you tell me what should i fix? or if you have better idea please tell me,
Regards,